(function () {
var as = angular.module('exampleApp.services', []);
        as.service('base64', function () {
        var keyStr = "ABCDEFGHIJKLMNOP" +
                "QRSTUVWXYZabcdef" +
                "ghijklmnopqrstuv" + "wxyz0123456789+/" +
                "=";
                this.encode = function (input) {                 var output = "",
                        chr1, chr2, chr3 = "",
                        enc1, enc2, enc3, enc4 = "",
                        i = 0;
                        while (i < input.length) {
                chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++);
                        chr3 = input.charCodeAt(i++);
                        enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                        enc4 = chr3 & 63;
                        if (isNaN(chr2)) {
                enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                enc4 = 64;
                }
                output = output +
                        keyStr.charAt(enc1) +
                        keyStr.charAt(enc2) +
                        keyStr.charAt(enc3) +
                        keyStr.charAt(enc4);
                        chr1 = chr2 = chr3 = "";
                        enc1 = enc2 = enc3 = enc4 = "";
                }

                return output;
                };
                this.decode = function (input) {
                var output = "",
                        chr1, chr2, chr3 = "",
                        enc1, enc2, enc3, enc4 = "",
                        i = 0;
                        // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
                        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
                        while (i < input.length) {
                enc1 = keyStr.indexOf(input.charAt(i++));
                        enc2 = keyStr.indexOf(input.charAt(i++));
                        enc3 = keyStr.indexOf(input.charAt(i++));
                        enc4 = keyStr.indexOf(input.charAt(i++));
                        chr1 = (enc1 << 2) | (enc2 >> 4);
                        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                        chr3 = ((enc3 & 3) << 6) | enc4;
                        output = output + String.fromCharCode(chr1);
                        if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
                }
                if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
                }

                chr1 = chr2 = chr3 = "";
                        enc1 = enc2 = enc3 = enc4 = "";
                }
                };
        });
})();              